Collapsed backbone, Figure 5. collapsed backbone topology, Chapter 1: overview 30 – Allied Telesis AT 8000/8POE User Manual
Page 30: L/a d/c d/c l/a d/c l/a, 8 port poe fast ethernet switch
Chapter 1: Overview
30
Collapsed
Backbone
In the topology illustrated in Figure 5, an AT-9424T Gigabit Ethernet
Switch forms the backbone that connects to servers and AT-8000/8POE
Fast Ethernet switches using Gigabit Ethernet uplinks. This type of
topology is often referred to as a collapsed backbone topology. The switch
functions as the focal point of the network and transfers an Ethernet frame
between the Fast Ethernet switches only when the destination end node
for the frame is on a different switch than the end node that originated the
frame. This reduces the amount of unnecessary data traffic in each
workgroup, freeing up bandwidth and improving network performance.
Figure 5. Collapsed Backbone Topology
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15
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19
21R
23R
2
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20
22R
24R
CLASS 1
LASER PRODUCT
AT-9424T
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3
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11
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15
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19
21R 23R
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4
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8
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22R 24R
TERMINAL
PORT
FAULT
MASTER
POWER
STATUS
SFP
21
22
23
24
L/A
D/C
D/C
L/A
D/C
L/A
1000 LINK / ACT
HDX / COL
FDX
10/100 LINK / ACT
PORT ACTIVITY
21
22
23
24
SFP
L/A
Gigabit Ethernet Switch
1282
Legend
100 Mbps
1000 Mbps
10 Mbps
AT-9424T
AT-8000/8POE
8 Port POE Fast Ethernet Switch
PoE
9
9R
1
3
5
7
2
4
6
8
TERMINAL POR
T
1
3
5
7
2
4
6
8
9
9R
POWER
10/100/1000 Base-T
SFP
UPLINK PORT
RS-232
DET ON ON
100 LINK ACT
10 LINK ACT
PD ON
MAX CURRENT
PD ERR
10/100 LINK
1000 LINK
ACT
ACT
CLASS 1
LASER PRODUCT
MAIN PORT ACTIVITY
UPLINK PORT ACTIVITY
820
AT-8000/8POE
8 Port POE Fast Ethernet Switch
PoE
9
9R
1
3
5
7
2
4
6
8
TERMINAL POR
T
1
3
5
7
2
4
6
8
9
9R
POWER
10/100/1000 Base-T
SFP
UPLINK PORT
RS-232
DET ON ON
100 LINK ACT
10 LINK ACT
PD ON
MAX CURRENT
PD ERR
10/100 LINK
1000 LINK
ACT
ACT
CLASS 1
LASER PRODUCT
MAIN PORT ACTIVITY
UPLINK PORT ACTIVITY
820
AT-8000/8POE
AT-8000/8POE
Wireless Network
301